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Usually the motherboard must match the memory type: registered memory will not work in a motherboard not designed for it, and vice-versa. Some PCs will accept registered memory, but registered and unregistered memory cannot be mixed. [3] There is much confusion between registered and ECC memory; it is widely thought that ECC memory will not work (without ECC functionality) in a motherboard without ECC support, although the compatibility issues arise when trying to use registered server memory (which also supports ECC and is described as ECC RAM) in a desktop PC motherboard."

I didn't thoroughly check out you specs but I think I saw 4 slots with a maximum of 4 GBs total memory. If true, then each slot would (most likely) be limited to a 1 GB module. Anyway, do your homework before buying any 2 GB modules.

Crucial list the RAM for this computer as "Non ECC", so the answer would be no.

FYI, my answer did not try to interfere (in any way) with your previous response. It was only intended to address the possible size limitation of the module per slot. So, do you now want to follow up and confirm that a 2x2GB module arrangement is OK or do you want to confirm that my suspicion is valid?

Crucial recommends 2x2GB modules and that configuration will not work on your PC so that answer would be no. Your hardware manual clearly indicates that each memory slot only supports up to a 1GB module. So, again, do your homework and ignore that Crucial recommendation. FYI, I worked the Crucial forums for many months and it is not uncommon for them to be in error at times

Please confirm that you do have 4 memory slots, and if so, they look like they should work because they match the requirements in your hardware manual as follows:

DIMMs
The memory sockets on the system board can be populated with up to four industry-standard DIMMs.
These memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum
memory support, you can populate the system board with up to 4 GB of memory configured in a high-
performing dual channel mode.
DDR2-SDRAM DIMMs
For proper system operation, the DDR2-SDRAM DIMMs must be:
● industry-standard 240-pin
● unbuffered PC2-5300 667 MHz-compliant
● 1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
● support CAS latency 4 and 5 for DDR2/667 MHz
● contain the mandatory JEDEC SPD information
In addition, the computer supports:
● 256Mbit, 512Mbit, and 1Gbit non-ECC memory technologies
● single-sided and double-sided DIMMs
● DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not
supported